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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311d2f16b7b68fdfb177d421793a793a928f8e64545c25157b54debd108df1b3' 
  AND token = 'k2fW6DhNmKKldrS0j/EMI+utHoJOYMW5me9A0VgWOz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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