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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccd1c639955fd288eee57b0ad286f8c12cd4a67d204ac30bd2b8480b3fc974d' 
  AND token = 'wa82ac5u5M33xlTeiI11jVTSeci8f/mWVUxBklRMK1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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