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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc32a47635c7639c1c62f097653ced94674d7b371cb285f17e9907ce0207abd' 
  AND token = 'PvYz0L/Why+t6aysMP+IUY1RniXuzHuNtFjSQ3WClZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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