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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3b9bdaae2fe41758856e64b811a52be992fced1ccf23e4a05f735f35a2e4ec' 
  AND token = 'D++utMrD+aI1P2qYhQL429Wongq4sNRaLFV1W9HyFog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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