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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0096f5c001a9e8a9ecfc5da23a4bc22e94a2c4a485c113103a6c02c34794c0' 
  AND token = '45F8R3Y2Cago+I+3x7/+Qr2GwlgMtNbf5B1+SzJB85Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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