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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634b7b41a96fd82d84558b0b5560883cde2e84315f44bbc4f8b7967ebfcdd462' 
  AND token = 'QprURucWkkwMJHEe5n94GUwj7ankoq+yh7XKirenR0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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