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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87b3ea3ac949c4d3843b63a84b6696e2a07ad32cb3c6dabf0a39a96d78886a3' 
  AND token = 'JYpHO5wNozt99NIgh22Su3awbyjOXDn31SXczWkgjh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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