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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad169ee15779d558f067816cf80f07feeb684801f4fdc9c081a969a2d09f288' 
  AND token = 'QWKGG8t2I+ADr8NyvdG7orY3DXugwB/eQJA1BkoC838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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