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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55f4c3b6d5982af8bb99e375e6e7d30d4a18be233136d7ffbcf8bd461cb18b7' 
  AND token = 'zFj0IK65PnYSNHdHes4Aq6Q11CnT6K4dX/0j3oprRWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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