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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ac12c5e0ef2e555e017bc5069bc4540edd4e49ed14ec386a6513d34ab1a749' 
  AND token = 'aCPTntwE4iJhxGOUAw1THL68YGTE3Pjgw6L9OsSO7+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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