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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689085ef39e1941c0187eaaa4f59e4fb3f82178a5c6f49e6f106cad7f118f32c' 
  AND token = 'W/SsHjrLBtMK5yS1eURa5nT7pIYxkOCRC2idkLbTGSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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