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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc97f7b62d2e58f274bad514dc960916f5f9c6ebc4fd3375c2b2d1bfe83afcf2' 
  AND token = 'JdYiAnyeRuI9n3YYEBXGt0oER8g8PbY+DCfnQCP7Byk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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