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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59d5ebd5e33ca0424b0767c8c890580c4bf46ad1db6c835d2473b02640a8e33' 
  AND token = '+3Knc6/6TA0nsFfOptyW6Fg0EnC2BoTu789YMl0RG8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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