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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba746ce01c36e7135c0bbdfe1b7f08cf2c9edb157db39c42cd90d9ee6ef8fc3' 
  AND token = '4AvhjkoFiaTtz7wO6LZ/gclSzZ3ij+8YbhRpUUmiAjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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