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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409c617502c113bf91374f04587414b59fa0f09b1e05b25b0b4c6598499f2d8d' 
  AND token = 'WNvsbziSDeTiHxUSxmBx+tcXY54ggLTSTiE71CH4Fw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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