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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c907cec38daf0b46d08dd4e3d849e8f516e498ee1fa0d25ac48f5a186669fe' 
  AND token = 'aMSJQIsXIci2bvnb0pvo+Cbpr7HK2V+ZGVS0eZxC5Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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