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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5829d9e7fbb8e95092e0a59306484de5f42c6a8dd4785bb74c41e006d6b9452a' 
  AND token = 'jr5Os/c9rAPrxeoli/VagzBEIQf6OSTHaS8+y3KbfHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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