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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09e49fd6d5ee1cfa2a39ccd174572af2471ceff54ee01fb810c676be07ead75' 
  AND token = 'QyjRF9xd0HdSXRuUQXDYa3WNDRHUf/Nh0k0y6usQftY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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