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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d90d03a576cafb700ffcc0360da161208451082cfe8311e2b1d8438dbafe05b' 
  AND token = 'JIH50Ih6bju2RqfyDlj5m9aYJnEZGrXxJzeKa0eJe4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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