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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa056320de35664436d514d0e7c6ef945eff97e56e3bee2c94d449e09d7f3f88' 
  AND token = 'OG8OVubIBYX6hEbgDlAsqln4SnnP+SOJqSyju6Ajfxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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