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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ba8803bd0079c0be6ead81a8a83fdf3b678af576fbc4f1c7d2fa9f77a9a5b4' 
  AND token = 'dbyl5ApWC6OyFN2jMAbzFba9rZ4Zlj9+PumqavCI5Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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