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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38e3e154cb739b634f1ad6c77be15a1a37fe98fac7541ade1d3e907ae9ef00a' 
  AND token = '53rNzTetY2YlCp5vwW9wJ0GAjRir+jwDFf8pn6rAzXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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