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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c232573faae060e56af52bb28720ec53e0f72c1168f7e32403afc8cfbbf0829' 
  AND token = 'fmqZI6fWbJH1IvJDccnDk3t3zRRe50JIwhE16SI0HjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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