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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62071d19c2c50880703efe405b9c1ad2db98911f7de4c604531d237d3a33863e' 
  AND token = 'wR9BgFvazHuU6I8bXxp/ze4peTr1C4u6PSL2auZaBH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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