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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0cfe5b4b0bca94e8ed9b74327f2f4741a9e27147ecbcb8443bcc59d320288f' 
  AND token = 'NzdBYaue2rEP4KTVmctAkvw/fEtd/f4zmMO7Aqfp3oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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