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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e528d6bb060efe9f691bc8b4b9fd0adeffae437cf45c724ff912f5d48b56bb3' 
  AND token = 'cL3ucMFsKmz5+VzjK3I2nI/o0lEwKN7T3EwT30d1qJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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