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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee8b0f856fb29ac4a7826100328f6a55047d485463338317b670a108293d015' 
  AND token = '6XEEn/Q9B5JK+aRy1YBNyxIdcoTUp4q44a6lcKpZLHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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