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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4d34cf446216ad3053bf8fea32db67298c11e5715d468e2ae1003cd38594d6' 
  AND token = '+SItTu7wLq/A7gCO7y2nM4Ijw5Lq3cL7U2/L4SwPauI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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