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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ed994d0657109b5ae5510308e7e4c4485282fb3eb0159873890f25ee76136a' 
  AND token = '+u7Fb62j95r19LTqyjUaIu9Y8g1Hwdbjm+AEBtocIUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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