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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c47b3955161cd3e91b77987bc590025e8f14de93b79282813a90b34d59f210' 
  AND token = 'pEguyKaWuLnbdPL3Y/3BNfslWBWe0rCX0R8eidM008s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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