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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838a379d1009ed66728b3d43bac3d0f1fb46567cf0599356847dac203b18a6d5' 
  AND token = 'UXM5zwisc5E6Q6XW5GPWwIQax5IdFcytj8vEJrIS3N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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