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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8ff590a8548a908d188b9d235b8ae6858285b4f76beb027ad71a97f0dddeb9' 
  AND token = 'hfJWWSNtpSNH2clEM99h2IP6pBV+jwC46iun/JfeBp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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