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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d477df1976aaf2cdd4e6172fec79c7b58dd509de3e867e08fdbdb34b821ca2' 
  AND token = 'qDgKAb5FYY0BzC6Ae02p1z8P00/vd6a4QTgdOeCFbwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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