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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd93802fe19a7d25a13281582c5c709268ef0a49e977ba121af07991dd79c74b' 
  AND token = 'WOZi9RCcoOtOiHZE9s5FOhaSJvBRZIsOas7i1bvYqlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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