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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca07194299dc3fc966b8c1a2a8b4ab172a23b7cd1e1425428aef65c52428e0e9' 
  AND token = 'POhwEFQoGVTt4/tYGVriLQwT4dqMU+54PzM5t7P2/jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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