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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9e48d4f6cfc902e2a609197b6e018da3f1315d9129a1e5c0daa50d0b104a86' 
  AND token = '6OPDah/LDSZjHDxHQF+pNqSWpuQhy9x7A4zQUJqAO/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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