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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fceb22176c51b57a74ab420f7c8f43d9e3069c7502e36ee1b08a11f4a3ddb6ad' 
  AND token = 'bAPuoJLQLHlNz+A2LVAc5ydD4Uha3oGoRtSi7Y2mPdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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