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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d912055b4964b543bddce5aff738795f1e788bd2c59d58567aa551e20a8707' 
  AND token = 'Un76vOZltlSKbIoOA47mHbDlqQ2F3I11MydiY8jh94M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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