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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572a7fb9fe7fe68c531e01c7fdffb85e7656d4b3c5324e25fe5a77543dda790e' 
  AND token = 'oOrwJCB67xzZv3qVuocS4BNV8u5kSAFzdc8y5aqnV5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}