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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19b9f2de0dbacb7a4ee0e7a68150f4202f3b60c34075ad00403095a02a7fa0a' 
  AND token = 'fnTAz651IaRmP9PC4r8F4bKwr5gEnL6Kml7Zy7Ca7Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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