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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf58ba4d18e76438fc1eaee21696492097968e9b19f6f5ba3d4f734bb66ed4ae' 
  AND token = 'sqbm3ffznQVYIts7jRrSmS80SSqsCdUD419PdETwABY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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