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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25e38b4a06b85c4f4f4e2b3d3f1276711cd2cb2cab8e23d101b949603fbfc69' 
  AND token = 'xDaHWBCfnbkUbX1o3oHs9rhz3uDYWT+p5OEI3fxb1wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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