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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bd4fe810f60c87e29e2964ed44818832c2b12e97b0b8a21d6e5d485ccefccd' 
  AND token = '+ipt5B13kQipbMTcaGwkW52Pf0lDSXOo3sQNo0HmAJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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