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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4494d914e03228398d0d269da323aaf233ffc4c2c2bab18e2adb28d4fae342a8' 
  AND token = 'ffrFVBJmMFOspMOt5Dsb/9WjpD//DSfHzlJ4bLfZhpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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