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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d77cf8b30c942a973b0b2c13bfc84d07d0aa6b837349c0185445874d0e06b77' 
  AND token = 'QkgJS6mLR1fTU7SUmAm5uc+xdl+462RcTHiZpiIwQ3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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