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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9063dc10c973df66915194d454f114d49e4843e90ea22ee5d804385905244286' 
  AND token = 'fi3S+ouUNNj5M+FPDgnhqBSorqnmgC58NB6C0Xn5JRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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