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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9e5833436f8a50556cea5ab3f1abc92cd1138f32c5139821258028425dd300' 
  AND token = 'qkKiQG8ckgr96Wx7td5N9vfmPdsrHlzm/fE2kws8f5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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