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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ed66391b3f08a43460dec6ee125835f276d0a6acaf95303bb52b53649c39ba' 
  AND token = 'THk4oQJ4DASQWi0oeOXGV75fL57VWUeARxtUhVUAh8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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