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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2600d2c559d4fe856fc8b896902039b5a1f38c8f24bd4ecc30924724a3815b' 
  AND token = 'HNnD7R0yDooCroiN4YM4SEGMBHWs2MPhKWMDmiXA4pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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