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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbd7aaabd6a665c9cde16807c60b17cb583f06df6162cf58412c8ea3dcc8c98' 
  AND token = 'YeNRRDyDlEy6x4e/ZDK0QT1dhT4YayNotc2eVfdvOok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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