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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6af4799d97d75f0c262be6ee1e406ef40ea0c17b8eee127e08b3f61b64261c' 
  AND token = '1xSTvF0NWsS7WgjP2un4l+vnoYRmpuByfe0oPQYwp1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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