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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929b7298209a194388b7346cbe021a6b0e9acddb944cce1ba59c4e1aa6f541ed' 
  AND token = 'SLfp4fOTqBE42P0+xa2BaL8waWFEqTzK9pqtohMiBG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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