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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a84283e47f57528c595c6608e80637379bcedccee6ee8390c9c36bb7735068' 
  AND token = '3Vv5UbUulkHncm1sJNrwuy91/Tp86gOCgonMOMpfF1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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