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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f55cf24baaaa2f7e3cf47c6b513471de410f1465aec1e3970eb7a3d26215bf2' 
  AND token = 'q6vtEk8c48bgrP59AbG4H4FfNqXJvfM/16AIPZAMV0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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