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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc77b55cd2cce7fe9b868eaa74878fd988d579422c4e1d6535349dd9262e08e' 
  AND token = 'FQA1qMaX+VX+I0RlGesIc3gbM9USaMyrgDxOlvsgS0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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