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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9437b8bd7a70d04469e31049bfdf84bb084712a8ec3f803399eb3ebe0db9c03c' 
  AND token = 'A9LN+RzxH6xr8GRGMleiZEeWDGDozILGTO8Xz7MlVqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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