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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bfcc0c01a25d334e60602df1d9a92b0effeb8175c0b7e8a4955ba5cbac76f3' 
  AND token = 'yM0gRqZv5exfJBxwPbuR82d+OY7cpqz5L6r5MN99SkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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