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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc401c9b711dd10c96f7787c44b1d48801364c109dd3e2e4a3c61a41de11ef01' 
  AND token = 'kFecdcJxLyzI14IsXng+B0X37nkgRwSeP4W530HURIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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