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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096a049731996f972a7a4f9cd237cb16bafaa56983d03f76355b598a7b01df7f' 
  AND token = 'nZANA0f/Z/3yjl6iRXTTRMkID+CcNlTdZFwh3jhke1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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